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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '814858ced0c3c2ef495963583972e1ba8e00ef9830cbfd891b3ccbf3faacb6c3' 
  AND token = 'QcLcyO5+SfNNNW5HrcI8TRMq6nfSTtemCW8DyD4rbyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}